EP1270513B1 - Procédé et installation pour le traitement de liquides aqueux contenant de la DCO - Google Patents

Procédé et installation pour le traitement de liquides aqueux contenant de la DCO Download PDF

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Publication number
EP1270513B1
EP1270513B1 EP20010870137 EP01870137A EP1270513B1 EP 1270513 B1 EP1270513 B1 EP 1270513B1 EP 20010870137 EP20010870137 EP 20010870137 EP 01870137 A EP01870137 A EP 01870137A EP 1270513 B1 EP1270513 B1 EP 1270513B1
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EP
European Patent Office
Prior art keywords
filter bed
bacteria
percolate
collected
collected percolate
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EP20010870137
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German (de)
English (en)
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EP1270513A1 (fr
Inventor
Willy Verstraete
Kris Van Hege
Dieter Geenens
Bart De Heyder
Chris Thoye
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Aquafin NV
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Aquafin NV
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Priority to EP20010870137 priority Critical patent/EP1270513B1/fr
Priority to AT01870137T priority patent/ATE358654T1/de
Priority to DE60127659T priority patent/DE60127659D1/de
Priority to US10/179,293 priority patent/US6811702B2/en
Publication of EP1270513A1 publication Critical patent/EP1270513A1/fr
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Publication of EP1270513B1 publication Critical patent/EP1270513B1/fr
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/06—Aerobic processes using submerged filters
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/04—Aerobic processes using trickle filters
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Definitions

  • the present invention relates to a process for treating a polluted aqueous liquid having a COD value caused by organic compounds present therein and a BOD/COD ratio smaller than 0.2, wherein the polluted aqueous liquid is percolated through a packed filter bed of a carrier material which is colonised with aerobic bacteria, enabling to degrade at least part of said organic compounds under aerobic conditions, and which forms an adsorbent for at least part of said organic compounds, the percolate which has passed through the filter bed is collected and a portion of the collected percolate is recirculated to the filter bed whilst a further portion of the collected percolate is removed as treated effluent showing a reduced COD value.
  • non-biodegradable is used in practice and in the present specification to indicate organic compounds which are not decomposed or degraded by the micro-organisms in common waste water treatment plants but which can only be decomposed by "specialist micro-organisms" and this only at a relatively low rate.
  • the process according to the invention is in particular directed to the further purification of domestic wastewater which has already been treated biologically, i.e. to the further purification of secondary activated sludge sewage effluent which still comprises typically as major organic constituents protein, carbohydrate, humin, tanin, lignin as well as small amounts of surfactant.
  • the process according to the invention is for example also further directed to the treatment of concentrates of reverse osmosis produced for example during the production of drinking water and containing, in addition to mineral salts, recalcitrant COD which may be caused for example by the presence of herbicides and pesticides.
  • recalcitrant COD which may be caused for example by the presence of herbicides and pesticides.
  • other polluted water streams containing recalcitrant COD in particular secondary activated sludge effluent from waste water treatment plants of the chemical or pharmaceutical industry, can also be treated.
  • WO99/37586 discloses a process for the further purification of wastewater which has already been pretreated physico-chemically and biologically.
  • the pretreated waste water has a COD value of about 500 mg/l and a BOD value smaller than 15 mg/l indicating the presence of a large amount of recalcitrant COD.
  • the contaminated water which contains a considerable amount of non-biodegradable organic compounds is mixed with process effluent and is percolated through a filter bed of activated carbon contained in a closed reactor system.
  • the activated carbon acts first of all as an adsorbent and as a catalyst for the biochemical oxidation of the organic compounds present in the contaminated water.
  • An in-situ regeneration of the activated carbon is provided by colonising it with bacteria. These bacteria provide for an aerobic biological decomposition of the organic compounds. In order to provide the necessary aerobic conditions for these aerobic decomposition processes, oxygen from air or from another oxygen containing gas is dissolved in the mixture of contaminated water and process effluent which is fed into the reactor. As a result of the biological decomposition processes, the life span of the activated carbon is increased or in other words the necessary replacements of the activated carbon filter can be delayed.
  • WO99/37586 discloses to increase the amount of oxygen dissolved in the mixture of contaminated water and effluent by pressurising this mixture to a pressure of 1 to 10 bars, preferably 1 to 3 bars above atmospheric pressure before saturating it with air. In this way an oxygen content of 10 to 100 mg O 2 /l, more particularly an oxygen content of 10 to 40 mg O 2 /l is achieved.
  • the filter bed is further contained in a pressure vessel wherein the pressurised mixture is kept at a substantially constant pressure so that the increased oxygen concentration is maintained in the mixture of contaminated water and effluent. Due to the increased amount of oxygen in this mixture, the efficiency of the aerobic biological decomposition processes occurring in the filter bed is enhanced and accumulation of organic compounds can thus be slowed down.
  • a drawback of the process disclosed in WO99/37586 is that not only sufficiently powerful pumps are required to pressurise the mixture of contaminated water and effluent and the gas to be introduced in this mixture, but the filter or reactor vessel and the attendant conduits have moreover to be constructed to withstand the applied pressures.
  • a further drawback of this known process is that a quite expensive saturation unit is required for intimately dispersing oxygen into the pressurised mixture of contaminated water and process effluent to dissolve oxygen into this mixture until it is saturated.
  • An object of the present invention is to provide a way wherein efficiency of the biological decomposition processes in a packed filter bed which is at the most partially submerged in the liquid percolating therethrough can be increased without requiring a saturation unit or a pressurisation of the system.
  • the filter bed is not only kept at the most partially submerged in the liquid percolating therethrough but said further portion of the collected percolate, which is removed as treated effluent, is removed from the collected percolate by means of a separation device which withholds the bacteria in said portion of the collected percolate which is recirculated to the filter bed to such an extent that the further portion which is removed as treated effluent from the collected percolate comprises a concentration of bacteria which is smaller than 10% of the bacterial concentration in the collected percolate.
  • the liquid fed to the filter bed flows between the particles of the carrier material leaving open pores filled with air.
  • This air provides aerobic conditions that enable the bacteria colonising the particles of the carrier material in this part of the filter bed to perform the required aerobic decomposition processes.
  • the further portion which is removed as treated effluent from the collected percolate comprises a concentration of bacteria which is smaller than 10%, preferably smaller than 1%, of the bacterial concentration in the collected percolate.
  • the concentration of bacteria in the collected percolate is 1 log larger than, preferably 2 log larger than the bacterial concentration in the effluent.
  • the separation device comprises a membrane filter, in particular a micro-filtration or ultra-filtration membrane filter.
  • An advantage of arranging such a separation device downstream the filter bed is that specialist bacteria, which have developed onto the carrier material of the filter bed and which are able to decompose specific organic compounds which are normally non-biodegradable, are kept in the system and are recycled to the filter bed.
  • Such a recycling offers the possibility to increase the concentration of specialist bacteria on the packed filter bed to a value required for achieving an optimal bacterial activity.
  • this bacterial concentration is otherwise not easy to be reached. This is due to the fact that the specialist bacteria grow on organic compounds that are hard to metabolise.
  • At least said portion of the collected percolate which is recirculated to the packed filter bed is aerated with an oxygen containing gas, in particular with air, before recirculating it to the packed filter bed.
  • the aeration can be carried out under atmospheric pressure or under a higher pressure in case a higher oxygen concentration is desired.
  • a higher pressure may also be used to increase the flow rate of the liquid mixture through the packed filter bed.
  • the present invention also relates to an installation for treating a polluted aqueous liquid in accordance with the process according to the invention.
  • This installation is characterised by the features defined in claim 13.
  • a polluted aqueous liquid which comprises recalcitrant COD or in other words non-biodegradable organic compounds is treated in order to decompose at least a portion of these compounds to lower the COD value of the liquid.
  • the polluted liquids show a BOD/COD ratio lower than 0.2 or even lower, for example lower than 0.15 or 0.10.
  • Normal wastewater from domestic or industrial origin show a larger BOD/COD ratio and is thus suitable for being treated in conventional wastewater treatment plants (WWTP) wherein the wastewater is treated physico-chemically and biologically.
  • the effluent of such WWTP is called secondary sewage effluent and shows a smaller BOD/COD ratio since most of the biodegradable organic compounds are removed therefrom.
  • it still contains a number of pollutants, including non-biodegradable organic compounds, which makes this effluent not suitable for reuse as process water or for ground water recharge applications.
  • Other polluted aqueous liquids which contain recalcitrant COD and which show a BOD/COD ratio lower than 0.2 are for example the concentrates of reverse osmosis processes, generated for example during the production of drinking water and containing, in addition to mineral salts often non-biodegradable organic compounds such as herbicides and pesticides.
  • BOD value Biological Oxygen Demand
  • COD value Chemical Oxygen Demand
  • the polluted water is percolated through a packed filter bed of a carrier material which is colonised with aerobic bacteria which enable to degrade at least part of the non-biodegradable organic compounds under aerobic conditions.
  • aerobic bacteria which enable to degrade at least part of the non-biodegradable organic compounds under aerobic conditions.
  • These bacteria are so-called specialist bacteria which grow or develop usually much slower than the bacteria in conventional activated sludge water purification installations for the biological treatment of domestic wastewater.
  • the BOD/COD ratio of the polluted water should be sufficiently low, in particular lower than 0.2, in order to avoid a competition, or at least a too strong competition, with the other bacteria which decompose biodegradable organic compounds and which can thus grow or develop much quicker than the specialist bacteria.
  • the carrier material should further form an adsorbent for at least part of the organic compounds in the polluted water so that these compounds are withdrawn from the water and concentrated on the surfaces of the carrier material. In this way, these compounds can more efficiently be decomposed by the bacteria colonising this carrier material.
  • Carrier materials which are able to adsorb dissolved organic compounds and which can be used in the process according to the present invention are activated carbon containing materials, activated carbon itself, lignite, zeolites, and synthetic adsorbent materials. According to the invention, preference is given to an activated carbon containing material, in particular to activated carbon.
  • the adsorption capacity of the carrier material can be quantified by means of the so-called Iodine number which is measured according to AWWA B604-74 (American Waste Water Association Specifications for granular activated carbon) and which shows a correlation with the internal surface (BET-surface developed by Brunauer, Emmett and Teller).
  • the carrier material shows a Iodine number of at least 500 mg/g and preferably of at least 800 mg/g.
  • Figure 1 shows an experimental set-up, or lab-scale installation, by means of which tests have been carried out to test the efficiency of the process according to the present invention.
  • This lab-scale installation comprises a feed tank 1 containing the polluted aqueous liquid to be treated.
  • the feed tank is provide with an agitator 2 driven by a motor 3.
  • a pump 4 arranged in a conduit 5 the polluted liquid is pumped at a predetermined flow rate to the reactor 6 containing the packed filter bed 7.
  • This filter bed is preferably formed by biological granular activated carbon (GAC).
  • GAC biological granular activated carbon
  • a diffuser 8 is provided which distributes the liquid fed to the reactor 6 over the top of the filter bed 7.
  • This diffuser 8 is for example composed of a large number of small tube sections. Instead or in addition to a diffuser 8, it is also possible to distribute the liquid by spraying over the top of the filter bed 7.
  • Below the filter bed 1 a course filter layer 9 of plastic matrices or a screen is arranged in the reactor 6 so that the particles of the filter bed are kept in the reactor without hampering the passage of the percolate flowing out of the filter bed 7.
  • the percolate which has passed through the filter bed 7 is collected and is pumped by means of a pump 10 disposed in a conduit 11 to a closed membrane module 12.
  • This membrane module 12 comprises a vessel 13 wherein a number of tubular membranes 14 are arranged. The interior of these tubular membranes is connected to a conduit 15 wherein a pump 16 is arranged to pump permeate which has passed through the membranes out of the membrane module 12.
  • the conduit 15 is further provided with a pressure gauge 17 to monitor the so-called transmembrane pressure (TMP).
  • an air inlet 18 is provided by means of which pressurised air or another oxygen containing gas can be fed into the membrane module 12 to dissolve oxygen into the percolate collected therein.
  • a distributor (not shown) is arranged to distribute the introduced air over the cross-sectional area of the module 12. This air will flow along the tubular membranes so that it does not only increase the amount of oxygen dissolved in the percolate but also contributes in preventing fouling of the membranes.
  • the membrane module 12 is connected by means of a conduit 19 to the top of the GAC reactor 6. Since the membrane module 12 is closed, the recirculation of liquid through this conduit 19 to the reactor 6 can be effected by means of the pump 10 pumping the percolate from the reactor 6 to the membrane module 12. Of course, it is also possible to arrange a further pump in the conduit 19, especially in case the vessel 13 of the membrane module 12 would not be closed. In a variant embodiment, the reactor 6 could be arranged concentrically around the vessel 13 of the membrane module 12 and the liquid in the vessel 13 could be allowed to flow over from the vessel 13 into the reactor 6. This liquid flow could be achieved by airlift technology, i.e. by means of the air introduced in the bottom of the vessel 13, instead of by means of the pump 10.
  • An essential feature of the process according to the invention is that the filter bed 7 is kept at the most partially submerged in the liquid percolating therethrough.
  • a level control 20 including a sensor for sensing the fluid level in the reactor 6 and means for controlling the operation of the pump 4 in the conduit between the feed tank 1 and the reactor 6 to increase the flow rate of the influent when the liquid level in the reactor drops below a predetermined minimum level and to reduce the flow rate of the influent when the liquid level in the reactor 6 exceeds a predetermined maximum level.
  • at least 20 volume % of the carrier material preferably at least 30 volume % and most preferably at least 50 volume % of the carrier material is kept non-submerged in the liquid percolating therethrough.
  • this layer of air coincides with the layer of diffuser elements 8.
  • this layer will be at atmospheric pressure but it is also possible to pressurise this gas layer, for example to increase the flux through the filter bed 7 in view of lowering the liquid level in the filter bed 7.
  • a further essential feature of the process according to the invention is that a portion of percolate, which is collected at the bottom of the filter bed 7, is recirculated to the filter bed whilst a further portion of the collected percolate is removed as treated effluent.
  • At least 50%, preferably at least 70% and most preferably at least 80% of the collected percolate is recirculated to the packed filter bed.
  • a higher degree of recirculation can be selected to achieve a stronger reduction of the COD value.
  • the degree of recirculation can also be adjusted to increase or decrease the moisture content of the carrier material in the non-submerged part of the filter bed: the higher the flow rate of liquid through this part, the more the pores will be filled with liquid.
  • the pore size, and therefore the volume of air in the carrier material in the non-submerged part of the filter bed also depends on the particle size of the carrier material.
  • This carrier material is preferably formed of a granular carrier material composed of particles, at least 95% of which show in particular a particle size larger than 0.3 mm (mesh-size 50 according to ASTM E11-87), preferably larger than 0.5 mm (mesh-size 35), but smaller than 5.6 mm (mesh-size 3.5), preferably smaller than 2.8 mm (mesh-size 7).
  • the polluted aqueous liquid is preferably percolated through the filter bed together with the portion of the collected percolate which is recirculated to the filter bed.
  • the recirculated percolate dilutes the incoming polluted liquid and in particular the concentration of compounds which may hamper the growth of the bacteria.
  • the polluted liquid may be added discontinuously, preference being given however to a continuous flow of influent into the filter bed, more particularly at a flow rate which is substantially equal to the flow rate of effluent out of the system.
  • the treated effluent is simply tapped of the vessel containing the collected percolate without any particular separation device.
  • a separation device which withholds bacteria is however used for removing the effluent from the collected percolate. Since the filter bed is colonised with bacteria, it will indeed be clear that some of these bacteria will arrive in the collected percolate.
  • the separation device should withhold the bacteria in the collected percolate to such an extend that the further portion or effluent which is removed from the collected percolate comprises a concentration of bacteria which is smaller than 10%, preferably smaller than 1%, of the bacterial concentration in the collected percolate.
  • the separation device should reduce the bacterial concentration with 1 log, preferably with 2 log.
  • An important advantage of the use of such a separation device is that the "loss" of specialist bacteria via the effluent is reduced and that most of the bacteria are recirculated to the filter bed. In this way, the amount of specialist bacteria in the filter bed, or the age thereof, is increased so that a more efficient biodegradation can be achieved.
  • separation device use can be made of different types of devices, for example centrifuges, but preference is given to membrane filtration devices as illustrated in Figure 1, in particular to micro- or ultrafiltration membrane filters.
  • ultra-filtration membranes have pore sizes of between 0.01 and 0.1 ⁇ m whilst micro-filtration membranes have pore sizes of between 0.1 and 1 ⁇ m.
  • micro-filtration membrane filters are preferred since they are fine enough to withhold bacteria.
  • Micro- or even ultra-filtration membranes are however still not fine enough to withhold the dissolved organic compounds present in WWTP effluent so that the biological filter bed is still required to remove these compounds.
  • a problem with packed filter beds and membrane filters is that they can become clogged or fouled.
  • fouling of the membranes can be reduced by aerating the collected percolate in the membrane module 12 with an oxygen containing gas, in particular with air, and by allowing this gas to rise in the collected percolate along the membranes of the membrane filter.
  • a further advantage of the aeration of the collected percolate is that the portion recycled to the filter bed contains a larger amount of oxygen thus enhancing the biodegradation of the organic compounds.
  • the polluted liquid preferably contains less than 35 mg/l, and most preferably less than 20 mg/l suspended solids. Should the polluted liquid contain more suspended solids, a prior separation of suspended solids, for example by means of a centrifuge or an additional settling step is preferably carried out.
  • the combined BioMAC installation (Biological Membrane Assisted Carbon filtration) used in this example and described hereabove with reference to Figure 1 consisted of two unit processes, biological granular activated carbon filtration and microfiltration. Waste water (WWTP effluent) was pumped into the first (GAC) column or reactor 6 and percolated through it. Subsequently, it is pumped into the second micro-filtration column, where part was filtered and part was recirculated over the first column.
  • Waste water WWTP effluent
  • the waste water was diffused over diffusers (upper 10 cm), percolated through the GAC (middle 15 cm) and collected at the bottom of the column (bottom 10 cm).
  • the GAC filter was kept 30 volume % non-submerged by a level control 20 directing the feed pump 4.
  • the active volume of the first column was 2 I.
  • Table 1 Caracteristics of the activated carbon filter bed Unit process Parameter Value GAC reactor Type Lurgi Hydrafin CC 8 x 30 Density (kg/m 3 ) 480 ⁇ 50 Particle size (mm) 0.5 - 2 Iodine number (mg/g) 950
  • the volume of this column is 2L.
  • the waste water is pumped upwards through the column; a part of it is recycled over the GAC reactor and another part is microfiltered. During the entire experiment, air was injected at the bottom of the second column at a flow rate of about 2L per minute.
  • Table 2 Characteristics of the membranes.
  • the permeate flow through the membranes was set at 2 l/h; taking into account the surface of the membranes, this corresponded to a flux of 20 l/h*m 2 .
  • the influent flow rate (Q) from the feed tank 1 was also set at 2 l/h.
  • the flow rate of the recycle pump 10 (Q R ) was set at 12 l/h, resulting in a recycle ratio Q R /Q of 6.
  • Transmembrane pressure (TMP) was measured by the pressure gauge 17 and was set at a maximum of 10 kPa.
  • the reactor was operated at room temperature (22 ⁇ 2 °C).
  • WWTP effluent obtained from the municipal WWTP's of Ghent and Wetteren (Belgium), was used. Sewage treatment in both plants consisted of primary sedimentation, followed by conventional activated sludge treatment and gravitational clarification. To obtain different reactor input concentrations, varying ratios of influent and effluent from the WWTP's were mixed prior to feeding to the experimental set-up.
  • the BioMAC reactor was operated continuously for 114 days with only WWTP effluent, and from day 115 to 129 with effluent spiked with influent to obtain higher input concentrations (shock load experiment), and a number of physico-chemical parameters were measured.
  • Figures 2 to 6 Results for the flux through the membrane module and for the analyses of TAN, nitrite, nitrate and COD are shown in Figures 2 to 6.
  • Figure 2 shows the flux decline for the entire period of 129 days.
  • Backwash cycles of the membrane filter (with permeate: 15 minutes at 4 l/h or air: 15 minutes at 400 kPa) were carried out on the days indicated by the arrows.
  • the GAC filter was replaced as indicated by the dotted arrow and the membranes were cleaned manually and subjected to a combined acid/caustic backwashing. No more backwashing was performed from day 100 on; the flux gradually decreased to 8 l/m 2 h.
  • Figure 3 shows the feed and permeate concentrations for TAN.
  • permeate TAN concentrations do not exceed 0.1 mg I -1 TAN, while an average TAN-removal of 90 % and a ratio SD feed /SD permeate of 24 could be calculated (SD: standard deviation).
  • SD standard deviation
  • the nitrite concentrations of the BioMAC feed and permeate are indicated.
  • Permeate nitrite concentrations are below 0.2 mg I -1 and the average removal and ratio of input to output SD were found to be 92 % and 16, respectively.
  • the high ratios between the standard deviations for TAN and nitrite substantiate the stability and robustness of the nitrification process as a ratio substantially larger than 1 is considered to be indicative for stable process performance.
  • the dissolved oxygen in the percolate leaving the filter bed was measured.
  • the average concentration of dissolved oxygen comprised 5.3 mg O 2 /l.

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Claims (14)

  1. Procédé de traitement d'un liquide aqueux pollué présentant une valeur DCO provoquée par des composés organiques qui y sont présents et un rapport DBO/DCO inférieur à 0,2, et dans lequel le liquide aqueux pollué est percolé au travers d'un lit filtrant compacté fait d'un matériau de support qui est colonisé par des bactéries aérobies, ce qui permet de dégrader au moins une partie desdits composés organiques dans des conditions aérobies, et qui forme un adsorbant pour au moins une partie desdits composés organiques, le percolat qui a traversé le lit filtrant et qui contient une concentration de bactéries est récolté, et une partie du percolat récolté est remis en circulation dans le lit filtrant, tandis qu'une autre partie du percolat récolté est éliminée en tant qu'effluent traité présentant une moindre valeur DCO, le lit filtrant étant au maximum maintenu partiellement immergé dans le liquide percolant à travers lui, caractérisé en ce que ladite autre partie est éliminée du percolat récolté au moyen d'un dispositif de séparation qui retient des bactéries dans ladite partie de percolat récolté qui est remise en circulation dans le lit filtrant, dans une mesure telle que l'autre partie qui est éliminée du percolat récolté en tant qu'effluent traité contient une concentration de bactéries qui est inférieure à 10% de la concentration bactérienne dans le percolat récolté.
  2. Procédé suivant la revendication 1, caractérisé en ce qu'au moins 20% en volume du matériau de support, de préférence au moins 30% en volume et le plus préférablement au moins 50% en volume du matériau de support sont maintenus non immergés dans le liquide percolant à travers lui.
  3. Procédé suivant la revendication 1 ou 2, caractérisé en ce que ledit lit filtrant compacté est formé d'un matériau de support granulaire composé de particules dont au moins 95% présentent en particulier une taille de particules de plus de 0,3 mm, de préférence de plus de 0,5 mm, mais de moins de 5,6 mm, de préférence de moins de 2,8 mm.
  4. Procédé suivant l'une quelconque de revendications qui précèdent, caractérisé en ce que ledit matériau de support est choisi dans le groupe formé par un matériau contenant du charbon actif, du charbon actif, de la lignite, des zéolites et un matériau absorbant synthétique, la préférence étant donnée à un matériau contenant du charbon actif, en particulier du charbon actif.
  5. Procédé suivant l'une quelconque de revendications qui précèdent, caractérisé en ce que ledit matériau de support présente un indice d'iode mesuré selon AWWA B604-74 d'au moins 500 mg/g et de préférence d'au moins 800 mg/g.
  6. Procédé suivant l'une quelconque de revendications qui précèdent, caractérisé en ce qu'une couche d'un gaz contenant de l'oxygène, en particulier une couche d'air, est maintenue au sommet du lit filtrant compacté, laquelle couche est maintenus substantiellement à la pression atmosphérique ou est pressurisée.
  7. Procédé suivant l'une quelconque de revendications qui précèdent, caractérisé en ce que ledit liquide aqueux pollué est percolé au travers du lit filtrant en même temps que ladite autre partie du percolat récolté qui est remise en circulation dans le lit filtrant.
  8. Procédé suivant l'une quelconque de revendications qui précèdent, caractérisé en ce que ledit dispositif de séparation retient les bactéries dans le percolat récolté dans une mesure telle que la concentration de bactéries dans ladite autre partie qui est éliminée du percolat récolté est de moins de 1% de la concentration bactérienne dans le percolat récolté.
  9. Procédé suivant l'une quelconque de revendications qui précèdent, caractérisé en ce que ledit dispositif de séparation comprend un filtre à membrane, en particulier un filtre à membrane de microfiltration ou d'ultrafiltration.
  10. Procédé suivant l'une quelconque de revendications 1 à 9, caractérisé en ce qu'au moins ladite partie du percolat récolté qui est remise en circulation dans le lit filtrant compacté est aérée par un gaz contenant de l'oxygène, en particulier de l'air, avant d'être remise en circulation dans le lit filtrant compacté.
  11. Procédé suivant les revendications 9 et 10, caractérisé en ce que l'on fait monter ledit gaz contenant de l'oxygène dans le perméat récolté le long dudit filtre à membrane.
  12. Procédé suivant l'une quelconque de revendications qui précèdent, caractérisé en ce qu'au moins 50%, de préférence au moins 70% et plus préférablement au moins 80% du percolat récolté sont remis en circulation dans le lit filtrant compacté.
  13. Installation pour le traitement d'un liquide aqueux pollué présentant une valeur CO provoquée par des composés organiques présents dans ce liquide et un rapport DBO/DCO de moins de 0,2, par un procédé tel que revendiqué par l'une quelconque des revendications 1 à 12, comprenant un réacteur avec un lit filtrant compacté fait d'un matériau de support qui est colonisé par des bactéries aérobies, ce qui permet de dégrader au moins une partie desdits composés organiques dans des conditions aérobies, et qui forme un adsorbant pour au moins une partie desdits composés organiques, des moyens pour alimenter le liquide aqueux pollué dans le lit filtrant, des moyens de récolte du percolat qui a traversé le lit filtrant et qui contient une concentration de bactéries, des moyens de remise en circulation d'une partie du percolat récolté dans le lit filtrant, des moyens pour contrôler le débit de liquide entrant dans et / ou sortant du lit filtrant afin de maintenir le lit filtrant au maximum partiellement immergé dans le liquide percolant à travers lui, et des moyens pour éliminer une autre partie du percolat récolter en tant qu'effluent traité, caractérisée en ce que lesdits moyens pour éliminer une autre partie du percolat récolté en tant qu'effluent traité comprennent un dispositif de séparation qui retient des bactéries dans ladite partie du percolat récolté qui est remise en circulation dans le lit filtrant de manière que l'autre partie qui est éliminée en tant qu'effluent traité du percolat récolté contiennent une concentration de bactéries qui est de moins de 10%, de préférence de moins de 1%, de la concentration bactérienne dans le percolat récolté.
  14. Installation suivant la revendication 13, caractérisée en ce que ledit dispositif de séparation comprend un filtre à membrane, en particulier un filtre à membrane de microfiltration ou d'ultrafiltration.
EP20010870137 2001-06-26 2001-06-26 Procédé et installation pour le traitement de liquides aqueux contenant de la DCO Expired - Lifetime EP1270513B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP20010870137 EP1270513B1 (fr) 2001-06-26 2001-06-26 Procédé et installation pour le traitement de liquides aqueux contenant de la DCO
AT01870137T ATE358654T1 (de) 2001-06-26 2001-06-26 Verfahren und vorrichtung zur behandlung csb- haltiger wässriger lösungen
DE60127659T DE60127659D1 (de) 2001-06-26 2001-06-26 Verfahren und Vorrichtung zur Behandlung CSB-haltiger wässriger Lösungen
US10/179,293 US6811702B2 (en) 2001-06-26 2002-06-26 Process and installation for treating a polluted aqueous liquid showing a COD value

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EP20010870137 EP1270513B1 (fr) 2001-06-26 2001-06-26 Procédé et installation pour le traitement de liquides aqueux contenant de la DCO

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EP1270513B1 true EP1270513B1 (fr) 2007-04-04

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EP (1) EP1270513B1 (fr)
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CN101636591A (zh) * 2007-03-06 2010-01-27 Dct双锥技术有限公司 一种将波动和/或不稳定能源转换为稳定能量源的方法
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EP1270513A1 (fr) 2003-01-02
ATE358654T1 (de) 2007-04-15
US20030006189A1 (en) 2003-01-09
US6811702B2 (en) 2004-11-02
DE60127659D1 (de) 2007-05-16

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